W, H, X = map(int, input().split())
ans = [[0]*(W+1) for _ in range(H+1)]

x1 = [1, 1, 0, -1, -1, -1, 0, 1, 0]
y1 = [0, 1, 1, 1, 0, -1, -1, -1, 0]
def debag():
    r = 0
    for x in range(H):
        for y in range(W):
            sm = 0
            for px, py in zip(x1, y1):
                cx = x+px; cy = y+py
                if 0<=cx<H and 0<=cy<W:
                    sm += ans[cx][cy]
            if r == 0:
                S = sm
            else:
                if sm != S:
                    return False
    return True
if X > 36:
    print(-1)
elif H==W==1:
    if X > 9:
        print(-1)
    else:
        print(X)
elif W == 1:
    if X > 9*W*2:
        print(-1)
    else:
        res = [min(X, 9), X-min(X, 9), 0]
        for i in range(H):
            print(res[i%3])
elif H == 1:
    if X > 9*H*2:
        print(-1)
    else:
        res = [min(X, 9), X-min(X,9), 0]
        for i in range(W):
            print(res[i%3], end = '')
else:
    a, b = X//4, X%4
    x = []
    for i in range(4):
        if b > 0:
            ex = 1
        else:
            ex = 0
        if i < 2:
            ans[0][i] = a + ex
            b -= 1
        else:
            ans[1][i-2] = a + ex
    for i in range(3):
        xx = []
        for j in range(3):
            xx.append(ans[i][j])
        x.append(xx)

    for i in range(H):
        for j in range(W):
            ans[i][j] = x[i%3][j%3]
        ans[i].pop()
        print(*ans[i], sep = '')
# print(debag())